Al and Tipper Gore

TIM SLOAN/AFP/Getty Images

Former US Vice President Al Gore (R) and his wife Tipper attend the grand opening ceremony of the William J. Clinton Presidential center in Little Rock, Arkansas 18 November 2004. Top Clinton administration officials, both Presidents Bush, rock stars, and ordinary admirers of Bill Clinton turned out for the ceremony to pay homage to President Clinton.

Former US Vice President Al Gore (R) and his wife Tipper attend the grand opening ceremony of the William J. Clinton Presidential center in Little Rock, Arkansas 18 November 2004. Top Clinton administration officials, both Presidents Bush, rock stars, and ordinary admirers of Bill Clinton turned out for the ceremony to pay homage to President Clinton. (TIM SLOAN/AFP/Getty Images)

Former US Vice President Al Gore (R) and his wife Tipper attend the grand opening ceremony of the William J. Clinton Presidential center in Little Rock, Arkansas 18 November 2004. Top Clinton administration officials, both Presidents Bush, rock stars, and ordinary admirers of Bill Clinton turned out for the ceremony to pay homage to President Clinton.